(function (doc, win) {
	var docEl = doc.documentElement,
	  resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
	  recalc = function () {
  var clientWidth = docEl.clientWidth;
  if (!clientWidth) return;
  docEl.style.fontSize = 50 * (clientWidth / 375) + 'px';
  console.log(docEl.style.fontSize)
	  };
  if (!doc.addEventListener) return;
  win.addEventListener(resizeEvt, recalc, false);
  doc.addEventListener('DOMContentLoaded', recalc, false);
  })(document, window);